linux-kernel - Re: [RFC PATCH 1/2] ASoC: add support of mclk clock providers in wm8894 driver

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Date:   Fri, 15 Dec 2017 11:51:22 +0000
From:   Charles Keepax <ckeepax@...nsource.cirrus.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Olivier Moysan <olivier.moysan@...com>, <lgirdwood@...il.com>,
        <perex@...ex.cz>, <tiwai@...e.com>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <alsa-devel@...a-project.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kernel@...inux.com>,
        <linux-kernel@...r.kernel.org>, <arnaud.pouliquen@...com>,
        <benjamin.gaignard@...com>, <patches@...nsource.wolfsonmicro.com>
Subject: Re: [RFC PATCH 1/2] ASoC: add support of mclk clock providers in
 wm8894 driver

On Thu, Dec 14, 2017 at 05:30:25PM +0000, Mark Brown wrote:
> On Thu, Dec 14, 2017 at 05:53:57PM +0100, Olivier Moysan wrote:
> 
> > +	pdata->mclk1 = devm_clk_get(wm8994->dev, "MCLK1");
> > +	if (IS_ERR(pdata->mclk1))
> > +		pdata->mclk1 = NULL;
> 
> These should special case -EPROBE_DEFER so we defer properly if we need
> to (and ideally log an error in case there was a MCLK and we legit ran
> into an error).

We probably want the special case on there being no clock at all
which should silently proceed as this code does and then actual
errors and PROBE_DEFERs can log and fail.

Thanks,
Charles